Question

There are two hemi-spherical object made of earth having the same shape
and size. If the total surface area of one hemi-spherical object is 462 square
cm. Find the total surface area of the sphere which is formed by attaching
those two hemi-spherical objects.
Surface Area of Cylinder and Sphere

Answer 1

Answer:

Total surface area of the hemisphere =462cm

2

Total surface area of the hemisphere =2πr

2

⇒462=3πr

2

⇒r=7 cm

Volume of hemisphere =

3

2

πr

3

V=

3

2

×

7

22

×7

3

V=718.67cm

3